<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
        "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>

    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <script src="js/jquery-3.2.1.min,js"></script>
    <script src="js/bootstrap.js"></script>
    <script type="text/javascript" src="js/example_02.js"></script>
    <script src="js/bootstrap.min.js"></script>

    <title>Title</title>
</head>



<body>
    <p id="demo">一个段落</p>
    <button type="button" onclick="myFunction()">尝试一下</button>
</body>
</html>